A liquid-vapor phase change process in microgravity conditions is carried out sufficiently slowly so that a one dimensional linear profile of temperature is observed throughout the vapor. Liquid (initially at the saturation temperature, Tsat) is suddenly exposed to a heated wall kept at Tw (where tw> T sat). A planar vapor film is formed and it propagates outward overtime. Find the variation of vapor temperature and phase interface position with time. assume that the liduid ahead of the interface remains at Tsat and neglect convective motion.